Margin rendering bug in IE9, using ExtJS 3.4

I'm using Ex开发者_开发技巧tJS 3.4 in IE9, and having an issue with drag & drop ordering in a TreePanel.

When you apply a margin to the html element using css, for some reason the margin overlaps the first few elements in the TreePanel, stopping you from dragging and re-ordering them. The higher you set the margin, the more elements become unusable.

I guess what I'm looking for is an IE9-only css fix that'll allow me to change the behaviour in that browser only.

Has anyone else experienced a similar issue in 3.4?

I had a similar issue, was caused by any of the tree control's containing elements being floated.