Applies alpha channel transparency to the picture displayed over the cell identified by the UniqueID parameter.
This property value can range from a default value of 0 (total opacity) to a value of 255 (total transparency). A value entered out of this range produces a value of 0.
Below you can see two buttons: the left one has a cell with a picture inside whose CellsManager.PictureTranspFactor property is set to 0, the cell on the right one has a picture with the CellsManager.PictureTranspFactor property set to 128.
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