Is there anyway to do a proper mask within dialogs for things like picture frames or custom loading bars? Closest things i can find is the blending option, but what i mean by mask is with most graphic programs you can make a layer a mask that covers a portion of an image you choose but can still allow anything behind that layer to show through. Ie loading bars usually are resize on the one end but instead the other end is mask to prevent distortion.
From what I know it is impossible to mask a dialog. If you want to make a Loadingbar that doesn't resize the picture that it has change:"Tiled" to "True". This is sorta uses a mask. (Create Dialog Item (Image))