ctButton的帮助文件里是这么说的：
Specifies the main image displayed in the button.
In order to set the picture of the control, it must be either set using the picture property page of the control, the property table of the host language (if available), or by assigning a picture from another control to this one.
Syntax
[form.]ctButton.Picture [ = Picture ]
Data Type
Picture
Example
ctButton.Picture = OLE_Object.Picture