Hi,
Love the package, it's fantastic!

There is just a small bug when using this control as a property on a member type.
The tree menu for selecting media items doesn't display, as treeMultiPickerDataEditor.cs is trying to load the control /members/treeMultiPickerInit.aspx (obviously does not exist).

To fix this, you just need to modify line 355 of treeMultiPickerDataEditor.cs to be as below:

string treeInitUrl = getInitUrl(string.Format("{0}/treeMultiPickerInit.aspx", umbraco.GlobalSettings.Path), parentNodeId, tt, false, true, TreeDialogModes.id, tt, parentNodeId.ToString(), "parent." + this.ClientID + "_TMP.TreeNodeClick");

After that is fixed the preview panel doesn't render correctly either, so a modification to treeMultiPicker.js on line 43 is required.

jQuery("#" + this._tblNodesID + " tr:last td.tmpNode").load("/umbraco/treeMultiPickerNode.aspx?rnd=" + Math.random() + "&treeType=" + this._treeType + "&id=" + nodeID);

I am using version 0.6.1 of Tree Multi Picker and Version 4.0.3 of Umbraco.

Cheers,
Neil