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EControl Syntax Editor SDK
TGutter.ExpandButtons Property

Specifies images for tree buttons on the gutter which displayed for line that can be collapsed.

property ExpandButtons: TBitmap;

ExpandButtons have to contain two images. First image is displayed for the expanded ranges, second - for the collapsed ranges. So dimensions of the ExpandButtons must be: 2W x H. 

Color of the left-bottom pixel is used as a transparent color. 

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