Microsoft KB Archive/82078

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INFO: Combo Box with Edit Control and Owner-Draw Style Incompatible

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Q82078

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The information in this article applies to:


 * Microsoft Win32 Software Development Kit (SDK)
 * Microsoft Windows Software Development Kit (SDK) 3.1

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SUMMARY
The owner-draw combo box styles (CBS_OWNERDRAWFIXED and CBS_OWNERDRAWVARIABLE) are incompatible with the combo box styles that contain an edit control (combo box styles CBS_SIMPLE and CBS_DROPDOWN). A combo box with either the CBS_SIMPLE or CBS_DROPDOWN style displays the currently selected item in its associated edit control. When an owner-draw style is specified for the combo box style CBS_SIMPLE or CBS_DROPDOWN, the current selection may not be displayed. Using the SetWindowText function to display the current selection in response to a CBN_SELCHANGE message may not be effective.

MORE INFORMATION
An owner-draw combo box can contain bitmaps or other graphic elements in its list box. Therefore, to correctly display the current selection, it is necessary to display a bitmap or other graphic element in the edit control. Because edit controls are not designed to display graphics, there is no natural method to display the current selection in an owner-draw combo box with an edit control.

The combo box style CBS_DROPDOWNLIST, which has a static text area instead of an edit control, can display any item, including graphics. Use this style combo box with the owner-draw styles.

Additional query words: WIN16SDK

Keywords : kbComboBox kbCtrl kbOSWinNT kbOSWin2000 kbSDKWin32 kbGrpDSUser kbOSWin

Issue type : kbinfo

Technology : kbWin32SDKSearch kbAudDeveloper kbWin3xSearch kbSDKSearch kbWin32sSearch kbWinSDKSearch kbWinSDK310