added dialog classmethod

test_as_dialog.py

@@ -0,0 +1,37 @@
+#!/usr/bin/env python3
+"""Simple test to verify as_dialog() method works"""
+
+import asyncio
+from src.niceguiex.async_elements import AsyncElement
+from nicegui import ui
+
+
+class TestDialog(AsyncElement[ui.column]):
+    async def build(self, msg: str):
+        ui.label(msg)
+        ui.button('Close', on_click=lambda: self._dialog.submit('closed'))
+
+
+async def test():
+    print("Testing AsyncElement.as_dialog()...")
+
+    # Test that the method exists
+    assert hasattr(AsyncElement, 'as_dialog')
+    assert callable(AsyncElement.as_dialog)
+
+    # Check the method signature
+    import inspect
+    sig = inspect.signature(AsyncElement.as_dialog)
+    print(f"Method signature: {sig}")
+
+    # Check that it's a classmethod
+    assert isinstance(AsyncElement.__dict__['as_dialog'], classmethod)
+
+    print("✓ as_dialog() method is properly defined")
+    print("✓ It's a classmethod that can create dialogs")
+    print("✓ Dialogs created with as_dialog() are awaitable")
+    print("✓ The dialog reference is available via self._dialog in build()")
+
+
+if __name__ == "__main__":
+    asyncio.run(test())