Dynamically set anchors

[Eraserhead]

i would like that when i drag object to main space in designer that anchors automatically set themselves. i dont see any function in childrenRect that i can use.

Please help!

Thank you.

[Eraserhead]

Not only anchors. Margins to. I tried with anchors changes but something like doesn't work.
@ states:

State {
name: "reanchored"

         AnchorChanges {
             target: mainWindow.children
             anchors.top: parent.top
             anchors.bottom: parent.bottom
             anchors.left: parent.left
             anchors.right: parent.right
         }

     }

@

[Edit: Added @ tags -- mlong]