Hi Raul,
You have two options:
After you apply the new ControText on the NGrouper you can set PaletteInheritance to all controls that are contained in the grouper to None, and set their Palette property to NUIManager.Palette:
int count = ctrl.Controls.Count;
for (int i = 0; i < count; i++)
{
INPaletteProvider paletteProviderControl = ctrl.Controls[i] as INPaletteProvider;
if (paletteProviderControl != null)
{
paletteProviderControl.PaletteInheritance = PaletteInheritance.None;
paletteProviderControl.Palette = NUIManager.Palette;
}
}
The other option is to set the TextFillStyle property of the NGrouper.HeaderItem:
ctrl.HeaderItem.Style.TextFillStyle = new NColorFillStyle(Color.White);