To reproduce:
RadMessageBox.Instance.Font = new Font("Segoe UI", 10);
foreach (Control c in RadMessageBox.Instance.Controls)
{
c.Font = new Font("Segoe UI", 14);
}
RadMessageBox.SetThemeName("TelerikMetro");
RadMessageBox.Show("test", "test2", MessageBoxButtons.YesNoCancel,
RadMessageIcon.Error, MessageBoxDefaultButton.Button2);
WORKAROUND: use smaller font size
We have added a ButtonSize property which will allow developers to define the size of the buttons of the message box. To access it use the following code: RadMessageBox.Instance.ButtonSize = new Size(150, 30);