| callback function corresponding to a double-click in ObjContainer (supplemental parameters are x, y, btn and mask)
x and y are cursor coordinates in container
btn can be any of following values :
| Value | Meaning |
| LBUTTON | left button is clicked |
| MBUTTON | middle button is clicked |
| RBUTTON | right button is clicked |
mask is a combination of values :
| Value | Meaning |
| MK_CONTROL | control key is pressed |
| MK_LBUTTON | left button is pushed |
| MK_MBUTTON | middle button is pushed |
| MK_RBUTTON | right button is pushed |
| MK_SHIFT | shift key is pushed |
|
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