Thanks Nicolai, I used an approach suggested by Merwan Ouddane in a private mail that consisted in changing "UITheme>>taskListFillStyleFor:" inside PolymorphWidgets Themes package changing the GradientFillStyle This is my result: =============================================== taskListFillStyleFor: aTasklist | aColor result | aColor := aTasklist color. result := GradientFillStyle ramp: { 0.0->aColor whiter whiter. 0.2->aColor muchDarker. 0.8->aColor darker. 1.0->aColor muchDarker}. ^ result origin: aTasklist topLeft; direction: 0 @ aTasklist height; radial: false; yourself. =============================================== Which is easier and more pleasant to my eyes Cheers, Offray El 26/01/15 a las 05:34, Nicolai Hess escribió:

2015-01-07 18:20 GMT+01:00 Offray Vladimir Luna Cárdenas <offray@riseup.net <mailto:offray@riseup.net>>:

Hi all,

As usual, when I put the mouse over the name of a window, a small preview appears with a grey allow with the full name of the window, but letters are white surrounded by a pale grey making the full name really difficult to read. There is any way to increase the contrast there between font and background?

This is defined in UIThemeWatery>>#newTaskbarThumbnailIn: aThemedMorph for: aWindow It looks better with the WateryTheme, because it uses a darker background. You can: - define your own theme as a Subclass of Pharo3Theme and overwrite this method - change the background(color) of the world.

Thanks,

Offray