[This is preliminary documentation and subject to change.]
Controls that require an image normally specify the name of the binary information in the text field and the binary data is looked up from the Binary table using this key. If this style bit is set, it means that the binary information is NOT coming from the Binary table, but instead the text field represents the handle to a bitmap or icon (in a string format) and this already loaded icon or bitmap must be used by the control. Obviously these handles cannot be authored previously, the actual value of the handle in the table has to be set by some action that is performed prior to creating the control. A possible use is to have an action to find all the running applications and put their names and icons into the ListView Table, and the control can display these names and icons, Even if this bit is on, other stylebits governing the size and stretching of the image are still observed. As an example: if an action puts a handle of an image in the table, but other stylebits describe a different size, the image will be still stretched.
Bitmap
CheckBox
Icon
ListView
PushButton
RadioButtonGroup
None.
0x00010000 = 65536