treecombobox NumGlyphs property
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Applies to
tcTreeComboBox component as subproperty of Button structure.  

property NumGlyphs: TNumGlyphs; // 1..4  

The NumGlyphs is the number of images specified in the Glyph property.  
Set NumGlyphs to the number of images provided by the bitmap assigned to the Glyph property. All images must be the same size and next to each other in a row. The Glyph property can provide up to four images.  

See also
Glyph property.