Hello.
What is the easiest way to color the frame on a textbox? Maybe an extension? Anyone who can help?
If you are happy with rectangles, set the textbox inside a vertical arrangement, then set colours,heights and widths to your liking:
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Hi, in addition to what @TIMAI2 has already suggested, by searchiing the forum you can find also several other methods.
One is here:
Or with an extension from @Patryk_F related to ListView. 
Another method is to create an overlapping window by using another extension from @VSATISH13 In that window you can embed a layout with a background picture, the wanted textbox, and you can make it appearing and disappearing only when you need.
By searching the forum is the best way to find a lot of possible solutions from wich you can learn, and that maybe you were not aware of.
All the best !
