How to set width or height for a new tool window

Hello,

Is this question about the PropertyGrid or our Docking & MDI for WPF? Assuming you are talking about the latter, then you can only set the initial size using DockSite.SetControlSize. In XAML you'd set the docking:DockSite.ControlSize attached property. When docking one ToolWindow to another interactively, you cannot change the size (as the source TW will assume the size of the target TW).