Very hard post to understand !
Anyway...heres what i think you meant?
solution
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+ MouseKeyboard: On Middle Clicked on Sprite3
-> Sprite3: Make Invisible
+ MouseKeyboard: On Right Clicked on Sprite3
-> Sprite3: Make Visible
+ Sprite3: [negated] Sprite3: Is visible
-> Items: Deactivate Drag & Drop movement
+ MouseKeyboard: On Left Clicked on Sprite
+ Sprite3: Is visible
-> Sprite: Activate Drag & Drop movement
+ MouseKeyboard: On Left Clicked on Sprite2
+ Sprite3: Is visible
-> Sprite2: Activate Drag & Drop movement
<img src="smileys/smiley5.gif" border="0" align="middle">