RAD Studio VCL Reference
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TOutline.PictureOpen Property

Specifies the bitmap used to represent an expanded item that has subitems.

Pascal
property PictureOpen: TBitmap;
C++
__property TBitmap PictureOpen;

By default, the PictureOpen property is an open file folder. Set PictureOpen to change the bitmap used for expanded nodes.

Note: The bitmap is not displayed in the outline unless the OutlineStyle property is set to osPictureText, osPlusMinusPictureText, or osTreePictureText.
 

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