DragContainer::EventMouseClick( right once left twice)

[angela4et]

this problem occured when i want to put a target frame on top of the drag container
here is part of my code


// when mouse click set the target frame

dragwindow_ ->subscribeEvent(CEGUI::DragContainer::EventMouseClick, CEGUI::Event::Subscriber(&UI_InventoryItem::SetActionBtn, this));


but when i run it, the function SetActionBtn only execute when mouse right click ONCE or mouse left click TWICE ....... what is going on ??