Hi Thanh,
Thank you for writing.
The
BackColor property is usually set through a
theme defining various colors for the different states.
TPF exposes an API for overriding the theme settings at run-time preserving the styles defined for all the element states:
Override Theme Settings at Run Time.
I created a simple example for toggling a color between two buttons inside
RadRibbonBar. Please check my code snippet below:
public partial class Form1 : Form
{
private Color initialColor;
public Form1()
{
InitializeComponent();
this.initialColor = this.radButtonElement1.BackColor;
this.radButtonElement1.Click += radButtonElement1_Click;
this.radButtonElement2.Click += radButtonElement2_Click;
}
private void radButtonElement1_Click(object sender, EventArgs e)
{
this.ResetColor(this.radButtonElement2);
this.ChangeBackColor(((RadButtonElement)sender));
}
private void radButtonElement2_Click(object sender, EventArgs e)
{
this.ResetColor(this.radButtonElement1);
this.ChangeBackColor(((RadButtonElement)sender));
}
private void ResetColor(RadButtonElement button)
{
if (button.BackColor != this.initialColor)
{
button.ResetThemeValueOverrides();
}
}
private void radButtonElement_Click(object sender, EventArgs e)
{
this.ChangeBackColor(((RadButtonElement)sender));
}
private void ChangeBackColor(RadButtonElement button)
{
button.SetThemeValueOverride(Telerik.WinControls.Primitives.FillPrimitive.BackColorProperty, Color.LightGreen, "",
typeof(Telerik.WinControls.Primitives.FillPrimitive));
button.SetThemeValueOverride(Telerik.WinControls.Primitives.FillPrimitive.GradientStyleProperty, GradientStyles.Solid, "",
typeof(Telerik.WinControls.Primitives.FillPrimitive));
}
}
I am also sending you a gif file showing the result on my end.
Should you have further questions please do not hesitate to write back.
Regards,
Hristo Merdjanov
Telerik
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