Only set drag and drop source property if the object is not NULL and inherits from TObject
Only set drag and drop source property if the object is not NULL and inherits from TObject


git-svn-id: acec3fd5b7ea1eb9e79d6329d318e8118ee2e14f@32843 27541ba8-7e3a-0410-8455-c3a389f83636

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