Hello ahmed almousa,
Thank you for writing.
In order to change the color of the RadCheckBox check mark, do the following steps:
1. Select in the Controls Strucure panel RadCheckBox >> RadCheckBoxElement.
2. Select in the Element States panel RadCheckBoxElement.ToggleState=On.
3. Select in the Elements panel RadCheckBoxCheckPrimitive and set the ForeColor property to whatever color you want.
For the back color and border select in the Elements panel - RadCheckMarkBackGround and RadCheckMarkBorder respectively and apply the appropriate repositories.
I hope this will help you, if you have further questions, feel free to ask.
the Telerik team
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