Article ID: 262441 - View products that this article applies to.
This article was previously published under Q262441
When you try to display a modal dialog box window in the Click event of a TabStrip control from Microsoft Windows Common Controls 6.0 Service Pack 3 (SP3), you receive the following error message:
This message appears only with the service pack 3 version of Mscomctl.ocx.
Run-time error '400' :
Form already displayed ; can't show modally.
This behavior occurs because the mouse capture is not released, so all of the mouse inputs still go to the TabStrip control window instead of the modal window.
Make a call to the ReleaseCapture API function before displaying the modal form. This releases the mouse capture from the TabStrip control window and restores normal mouse input processing.
Steps to Reproduce Behavior