diff --git a/dvx/dvxApp.c b/dvx/dvxApp.c
index b034276..7ee1df3 100644
--- a/dvx/dvxApp.c
+++ b/dvx/dvxApp.c
@@ -1039,6 +1039,80 @@ const char *dvxClipboardGet(int32_t *outLen) {
 }
 
 
+// ============================================================
+// dvxCascadeWindows
+// ============================================================
+//
+// Arrange all visible, non-minimized windows in a staggered
+// diagonal pattern from the top-left corner.
+
+void dvxCascadeWindows(AppContextT *ctx) {
+    int32_t screenW = ctx->display.width;
+    int32_t screenH = ctx->display.height;
+    int32_t offsetX = 0;
+    int32_t offsetY = 0;
+    int32_t step    = CHROME_TITLE_HEIGHT + CHROME_BORDER_WIDTH;
+
+    // Default cascade size: 2/3 of screen
+    int32_t winW = screenW * 2 / 3;
+    int32_t winH = screenH * 2 / 3;
+
+    if (winW < MIN_WINDOW_W) {
+        winW = MIN_WINDOW_W;
+    }
+
+    if (winH < MIN_WINDOW_H) {
+        winH = MIN_WINDOW_H;
+    }
+
+    for (int32_t i = 0; i < ctx->stack.count; i++) {
+        WindowT *win = ctx->stack.windows[i];
+
+        if (win->minimized || !win->visible) {
+            continue;
+        }
+
+        // Un-maximize if needed
+        if (win->maximized) {
+            win->maximized = false;
+        }
+
+        // Dirty old position
+        dirtyListAdd(&ctx->dirty, win->x, win->y, win->w, win->h);
+
+        win->x = offsetX;
+        win->y = offsetY;
+        win->w = winW;
+        win->h = winH;
+
+        wmUpdateContentRect(win);
+        wmReallocContentBuf(win, &ctx->display);
+
+        if (win->onResize) {
+            win->onResize(win, win->contentW, win->contentH);
+        }
+
+        if (win->onPaint) {
+            RectT fullRect = {0, 0, win->contentW, win->contentH};
+            win->onPaint(win, &fullRect);
+            win->contentDirty = true;
+        }
+
+        // Dirty new position
+        dirtyListAdd(&ctx->dirty, win->x, win->y, win->w, win->h);
+
+        offsetX += step;
+        offsetY += step;
+
+        // Wrap around if we'd go off screen
+        if (offsetX + winW > screenW || offsetY + winH > screenH) {
+            offsetX = 0;
+            offsetY = 0;
+        }
+    }
+}
+
+
 // ============================================================
 // dvxCreateAccelTable
 // ============================================================
@@ -1347,6 +1421,244 @@ int32_t dvxSetWindowIcon(AppContextT *ctx, WindowT *win, const char *path) {
 }
 
 
+// ============================================================
+// dvxTileWindows
+// ============================================================
+//
+// Tile all visible, non-minimized windows in a grid pattern.
+// Columns = ceil(sqrt(count)), rows = ceil(count / cols).
+// Last row may have fewer windows, which are widened to fill.
+
+void dvxTileWindows(AppContextT *ctx) {
+    int32_t screenW = ctx->display.width;
+    int32_t screenH = ctx->display.height;
+
+    // Count eligible windows
+    int32_t count = 0;
+
+    for (int32_t i = 0; i < ctx->stack.count; i++) {
+        WindowT *win = ctx->stack.windows[i];
+
+        if (!win->minimized && win->visible) {
+            count++;
+        }
+    }
+
+    if (count == 0) {
+        return;
+    }
+
+    // Integer ceil(sqrt(count)) for column count
+    int32_t cols = 1;
+
+    while (cols * cols < count) {
+        cols++;
+    }
+
+    int32_t rows = (count + cols - 1) / cols;
+    int32_t tileW = screenW / cols;
+    int32_t tileH = screenH / rows;
+
+    if (tileW < MIN_WINDOW_W) {
+        tileW = MIN_WINDOW_W;
+    }
+
+    if (tileH < MIN_WINDOW_H) {
+        tileH = MIN_WINDOW_H;
+    }
+
+    int32_t slot = 0;
+
+    for (int32_t i = 0; i < ctx->stack.count; i++) {
+        WindowT *win = ctx->stack.windows[i];
+
+        if (win->minimized || !win->visible) {
+            continue;
+        }
+
+        if (win->maximized) {
+            win->maximized = false;
+        }
+
+        dirtyListAdd(&ctx->dirty, win->x, win->y, win->w, win->h);
+
+        int32_t row = slot / cols;
+        int32_t col = slot % cols;
+
+        // Last row: fewer windows get wider tiles
+        int32_t remaining = count - row * cols;
+        int32_t rowCols   = (remaining < cols) ? remaining : cols;
+        int32_t cellW     = screenW / rowCols;
+
+        win->x = col * cellW;
+        win->y = row * tileH;
+        win->w = cellW;
+        win->h = tileH;
+
+        wmUpdateContentRect(win);
+        wmReallocContentBuf(win, &ctx->display);
+
+        if (win->onResize) {
+            win->onResize(win, win->contentW, win->contentH);
+        }
+
+        if (win->onPaint) {
+            RectT fullRect = {0, 0, win->contentW, win->contentH};
+            win->onPaint(win, &fullRect);
+            win->contentDirty = true;
+        }
+
+        dirtyListAdd(&ctx->dirty, win->x, win->y, win->w, win->h);
+
+        slot++;
+    }
+}
+
+
+// ============================================================
+// dvxTileWindowsH
+// ============================================================
+//
+// Tile all visible, non-minimized windows horizontally:
+// side by side left to right, each window gets full screen height.
+
+void dvxTileWindowsH(AppContextT *ctx) {
+    int32_t screenW = ctx->display.width;
+    int32_t screenH = ctx->display.height;
+
+    // Count eligible windows
+    int32_t count = 0;
+
+    for (int32_t i = 0; i < ctx->stack.count; i++) {
+        WindowT *win = ctx->stack.windows[i];
+
+        if (!win->minimized && win->visible) {
+            count++;
+        }
+    }
+
+    if (count == 0) {
+        return;
+    }
+
+    int32_t tileW = screenW / count;
+
+    if (tileW < MIN_WINDOW_W) {
+        tileW = MIN_WINDOW_W;
+    }
+
+    int32_t slot = 0;
+
+    for (int32_t i = 0; i < ctx->stack.count; i++) {
+        WindowT *win = ctx->stack.windows[i];
+
+        if (win->minimized || !win->visible) {
+            continue;
+        }
+
+        if (win->maximized) {
+            win->maximized = false;
+        }
+
+        dirtyListAdd(&ctx->dirty, win->x, win->y, win->w, win->h);
+
+        win->x = slot * tileW;
+        win->y = 0;
+        win->w = tileW;
+        win->h = screenH;
+
+        wmUpdateContentRect(win);
+        wmReallocContentBuf(win, &ctx->display);
+
+        if (win->onResize) {
+            win->onResize(win, win->contentW, win->contentH);
+        }
+
+        if (win->onPaint) {
+            RectT fullRect = {0, 0, win->contentW, win->contentH};
+            win->onPaint(win, &fullRect);
+            win->contentDirty = true;
+        }
+
+        dirtyListAdd(&ctx->dirty, win->x, win->y, win->w, win->h);
+
+        slot++;
+    }
+}
+
+
+// ============================================================
+// dvxTileWindowsV
+// ============================================================
+//
+// Tile all visible, non-minimized windows vertically:
+// stacked top to bottom, each window gets full screen width.
+
+void dvxTileWindowsV(AppContextT *ctx) {
+    int32_t screenW = ctx->display.width;
+    int32_t screenH = ctx->display.height;
+
+    // Count eligible windows
+    int32_t count = 0;
+
+    for (int32_t i = 0; i < ctx->stack.count; i++) {
+        WindowT *win = ctx->stack.windows[i];
+
+        if (!win->minimized && win->visible) {
+            count++;
+        }
+    }
+
+    if (count == 0) {
+        return;
+    }
+
+    int32_t tileH = screenH / count;
+
+    if (tileH < MIN_WINDOW_H) {
+        tileH = MIN_WINDOW_H;
+    }
+
+    int32_t slot = 0;
+
+    for (int32_t i = 0; i < ctx->stack.count; i++) {
+        WindowT *win = ctx->stack.windows[i];
+
+        if (win->minimized || !win->visible) {
+            continue;
+        }
+
+        if (win->maximized) {
+            win->maximized = false;
+        }
+
+        dirtyListAdd(&ctx->dirty, win->x, win->y, win->w, win->h);
+
+        win->x = 0;
+        win->y = slot * tileH;
+        win->w = screenW;
+        win->h = tileH;
+
+        wmUpdateContentRect(win);
+        wmReallocContentBuf(win, &ctx->display);
+
+        if (win->onResize) {
+            win->onResize(win, win->contentW, win->contentH);
+        }
+
+        if (win->onPaint) {
+            RectT fullRect = {0, 0, win->contentW, win->contentH};
+            win->onPaint(win, &fullRect);
+            win->contentDirty = true;
+        }
+
+        dirtyListAdd(&ctx->dirty, win->x, win->y, win->w, win->h);
+
+        slot++;
+    }
+}
+
+
 // ============================================================
 // executeSysMenuCmd
 // ============================================================
diff --git a/dvx/dvxApp.h b/dvx/dvxApp.h
index a218fd9..c2b1158 100644
--- a/dvx/dvxApp.h
+++ b/dvx/dvxApp.h
@@ -118,6 +118,18 @@ void dvxFreeAccelTable(AccelTableT *table);
 // Add an entry to an accelerator table
 void dvxAddAccel(AccelTableT *table, int32_t key, int32_t modifiers, int32_t cmdId);
 
+// Arrange windows in a staggered diagonal cascade pattern
+void dvxCascadeWindows(AppContextT *ctx);
+
+// Tile windows in a grid pattern
+void dvxTileWindows(AppContextT *ctx);
+
+// Tile windows horizontally (side by side left to right, full height)
+void dvxTileWindowsH(AppContextT *ctx);
+
+// Tile windows vertically (stacked top to bottom, full width)
+void dvxTileWindowsV(AppContextT *ctx);
+
 // Copy text to the shared clipboard
 void dvxClipboardCopy(const char *text, int32_t len);
 
diff --git a/dvxdemo/demo.c b/dvxdemo/demo.c
index bbebae3..afb904a 100644
--- a/dvxdemo/demo.c
+++ b/dvxdemo/demo.c
@@ -32,7 +32,11 @@
 #define CMD_VIEW_SIZE_SMALL 307
 #define CMD_VIEW_SIZE_MED   308
 #define CMD_VIEW_SIZE_LARGE 309
-#define CMD_HELP_ABOUT  400
+#define CMD_WIN_CASCADE  350
+#define CMD_WIN_TILE_H   351
+#define CMD_WIN_TILE_V   352
+#define CMD_WIN_TILE     353
+#define CMD_HELP_ABOUT   400
 #define CMD_CTX_CUT     500
 #define CMD_CTX_COPY    501
 #define CMD_CTX_PASTE   502
@@ -205,6 +209,22 @@ static void onMenuCb(WindowT *win, int32_t menuId) {
             setupControlsWindow(ctx);
             break;
 
+        case CMD_WIN_CASCADE:
+            dvxCascadeWindows(ctx);
+            break;
+
+        case CMD_WIN_TILE_H:
+            dvxTileWindowsH(ctx);
+            break;
+
+        case CMD_WIN_TILE_V:
+            dvxTileWindowsV(ctx);
+            break;
+
+        case CMD_WIN_TILE:
+            dvxTileWindows(ctx);
+            break;
+
         case CMD_HELP_ABOUT:
             dvxMessageBox(sCtx, "About DV/X Demo",
                           "DV/X GUI Demonstration\n\n"
@@ -855,6 +875,15 @@ static void setupMainWindow(AppContextT *ctx) {
                 }
             }
 
+            MenuT *winMenu = wmAddMenu(bar, "&Window");
+
+            if (winMenu) {
+                wmAddMenuItem(winMenu, "&Cascade", CMD_WIN_CASCADE);
+                wmAddMenuItem(winMenu, "Tile &Grid", CMD_WIN_TILE);
+                wmAddMenuItem(winMenu, "Tile &Horizontal", CMD_WIN_TILE_H);
+                wmAddMenuItem(winMenu, "Tile &Vertical", CMD_WIN_TILE_V);
+            }
+
             MenuT *helpMenu = wmAddMenu(bar, "&Help");
 
             if (helpMenu) {