WinForms Radio Group - Custom draw radio items

This example creates a custom radio group control that allows you to manually paint radio items:

void OnCustomDrawItem(object sender, CustomDrawEventArgs e) {
    if (e.ItemInfo.CheckState == CheckState.Checked) {
        e.ItemInfo.Appearance.Font = new Font(e.ItemInfo.Appearance.Font, FontStyle.Bold | FontStyle.Underline);
    }
    if (e.ItemInfo.State == DevExpress.Utils.Drawing.ObjectState.Hot) {
        LinearGradientBrush brush = new LinearGradientBrush(e.ItemInfo.Bounds, Color.LightBlue, Color.Cyan, LinearGradientMode.ForwardDiagonal);
        e.Cache.FillRectangle(brush, e.ItemInfo.Bounds);
        e.CheckPainter.DrawObject(e.ItemInfo);

        e.Handled = true;
    }
}

Note

You can also use the following pre-designed and ready-to-use group controls shipped as part of DevExpress WinForms UI Templates:

• Chip Group
• Multi-Select Chip Group
• Radio Button Group
• Toggle Button Group

DevExpress WinForms UI Templates include predesigned and ready-to-use UI components and forms (C# and Visual Studio 2022 only).

Files to Review

• CustomDrawEventArgs.cs (VB: CustomDrawEventArgs.vb)
• CustomRadioGroup.cs (VB: CustomRadioGroup.vb)
• CustomRadioGroupPainter.cs (VB: CustomRadioGroupPainter.vb)
• Main.cs (VB: Main.vb)
• Program.cs (VB: Program.vb)
• RepositoryItemCustomRadioGroup.cs (VB: RepositoryItemCustomRadioGroup.vb)

Documentation

• Custom Editors

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