function OnDesignerOpenForm()
{
	var title = "Open WebForm";
	var path = APP_PATH;
	var filter = "WebForm JSON File|*.json|All Files|*.*";
	var filename = ShowOpenFileDialog(title, path, filter);

	if (filename)
	{
		try
		{
			w2ui_webform_destroy();

			var json = ReadTextFile(filename);
			var FORM = JSON.parse(json);

			W2_CONTROL_INDEX = FORM.W2_CONTROL_INDEX;
			var index = 0;
			WEB_FORM = null;

			function _async_insert()
			{
				var control = FORM.CONTROLS[index];
				var w2json = w2ui_control_add(control, false);

				if (!WEB_FORM && w2json.w2type == "w2webform") 
				{
					WEB_FORM = w2json;
					WEB_FORM.filename = filename;
				}

				if (++index < FORM.CONTROLS.length)
				{
					window.setTimeout(_async_insert, 0);
				}
				else
				{
					AttachDragDrop();					
					EditorRefreshDatabaseSchema();
					PropGridPopulateComboBox();					

					CLIENT_TIER.model.setValue(FORM.CLIENT_TIER_SCRIPT || "");										
					CLIENT_TIER.viewstate = FORM.CLIENT_TIER_VIEW || null;

					SERVER_TIER.model.setValue(FORM.SERVER_TIER_SCRIPT || "");										
					SERVER_TIER.viewstate = FORM.SERVER_TIER_VIEW || null;

					EditorSetSqlStatements(FORM.SQL_STATEMENTS || []);					
										
					EditorSetModelBreakPoints(CLIENT_TIER.model, FORM.CLIENT_BREAKPOINTS || []);
					EditorSetModelBreakPoints(SERVER_TIER.model, FORM.SERVER_BREAKPOINTS || []);

					EditorLoadCodeFromCurrentTierModel();
					EditorRefreshControlDeclarations();					
					EditorRefreshSQLDeclarations();					
				}
			}

			window.setTimeout(_async_insert, 0);
		}
		catch (e)
		{
		}
	}
}