Microsoft KB Archive/111096

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BUG: Size of Owner-Draw Drop-Down Combo Box in Dialog Is Wrong

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Q111096

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The information in this article applies to:


 * Microsoft Windows Software Development Kit (SDK) 3.1

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SYMPTOMS
When creating an owner-draw drop-down combo box in a dialog box, the size of the static portion is not the same as a non-owner-draw combo box in the same dialog box. WM_MEASUREITEM is not being processed, and therefore the size of the owner-draw combo box and non-owner-draw combo box should be the same.

CAUSE
When creating a dialog box, the Dialog Manager determines how big the owner- draw combo box should be based on the system font. If you specify a font in your dialog box resource, this font should be used rather than the system font in determining the size of the controls. Unfortunately, the Dialog Manager uses the system font when determining the size of the static portion of an owner-draw combo box, regardless of whether a different font has been specified in the dialog box resource.

RESOLUTION
To circumvent this problem, process the WM_MEASUREITEM message, specifying the height of the items in your combo box. Windows correctly sizes the static portion when you handle the WM_MEASUREITEM message.

STATUS
Microsoft has confirmed this to be a bug in Windows version 3.1.

Additional query words: combobox ownerdraw dropdown

Keywords : kb16bitonly kbComboBox kbCtrl kbGrpDSUser kbOSWin310bug

Issue type : kbbug

Technology : kbAudDeveloper kbWin3xSearch kbSDKSearch kbWinSDKSearch kbWinSDK310