Widget API: Region:Show

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This function makes a frame visible.

object:Show()

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Makes a frame visible. Note that if a frame's parent is hidden, the frame displayed will not appear until its parent is shown as well.

Performance note: If a lot of frames are shown for the first time at once (like in action bar mods), then the interface may hang for a few seconds, I found no way to fix this.

Protected function: I found that Frames of type Button can't call this method if the player is in combat. ¿Any one else seen the same behaviour?

Note: If the frame is not visible, then the OnHide event will be called before OnShow.