&gt; My window manager should dictate how windows looks. This works for all toolkits, from GTK2 over FLTK over Qt all the way to Mono&#x27;s GDI. All, except GTK3.<p>So you&#x27;re arguing that because the window decorations are consistent, apps are consistent?<p>Hate to break it to you, but running a GTK2 app under KDE&#x2F;KWin will still look inconsistent.<p>The only way you get to be consistent, is by having your app developers use the same toolkit. I don&#x27;t see why the windows&#x27; frame should be regarded as &quot;special&quot; when all the button&#x2F;tabs&#x2F;filechooser&#x2F;… widgets are different depending on the toolkit.