This window is grey because your OS is grey and just like the other gadgets: it's a window of the OS.
A solution: pick a spare day and make your own window gadget, which you can completely customize, gfx-wise and feature-wise.
Another more simple solution: put a panel on the window-form, and give the panel a color with SetPanelcolor mypanel,r,g,b. This then only changes the form tho, not the outer parts of a window.
You use this panel as parent for your gadgets then..
A solution: pick a spare day and make your own window gadget, which you can completely customize, gfx-wise and feature-wise.
Another more simple solution: put a panel on the window-form, and give the panel a color with SetPanelcolor mypanel,r,g,b. This then only changes the form tho, not the outer parts of a window.
You use this panel as parent for your gadgets then..