Custom Controls Must Use CS_DBLCLKS with Dialog Editor

• Microsoft Windows Software Development Kit (SDK) versions 3.0 and 3.1
• Microsoft Win32 Application Programming Interface (API) included with:

      - Microsoft Windows NT versions 3.5 and 3.51
      - Microsoft Windows 95 version 4.0
  

SUMMARY

For a custom control to function properly with the Dialog Editor, the custom control window class must include the CS_DBLCLKS style.

If the custom control does not have the CS_DBLCLKS style, double- clicking the control in the Dialog Editor does not cause the custom control function to display its style dialog box. However, the control's style dialog box is still accessible from the Styles command on the Edit menu.

MORE INFORMATION

The Dialog Editor subclasses each control it creates and processes WM_LBUTTONDBLCLK messages. In response to this message, the custom control is asked to display its style dialog box.

If the custom control window class does not have the CS_DBLCLKS style, Windows does not send any WM_LBUTTONDBLCLK messages to the control. As a result, the Dialog Editor does not call the style dialog box function for the custom control and no dialog box appears.

NOTE: This article does not apply to the resource editor included with the Visual C++ development environment.