The transparent form border (glass effect) is the default window style in Vista. Icons for tabs can be set with ImageList for TabControl and ImageIndex/Key for TabPage. The rounded tabs may be done with DrawMode=OwnerDrawFixed and custom painted - it may also be no Tabcontrol at all, just some painted tabs that control the document area. Combining tabs into titlebar, or more likely no title bar and controlbox into tabcontrol, is more difficult, I have no suggestions for this. I would think there is actually no titlebar and no Tabcontrol, both is probably done using custom controls. If I recall the Vista glass effect can be applied to for example a panel using some API call.