To reproduce:
- click a RadCheckBox with the right mouse button and you will notice the the state of the checkbox is changed.

Workaround:

public class LeftCheckBox : RadCheckBox
{
    protected override void OnMouseUp(MouseEventArgs e)
    {
        if (e.Button == System.Windows.Forms.MouseButtons.Left)
        {
            base.OnMouseUp(e);
        }
    }

    public override string ThemeClassName
    {
        get
        {
            return typeof(RadCheckBox).FullName;
        }
        set
        {
        }
    }
}

To reproduce: Add a RadRadioButton to a form. Add a Button which opens a OpenFileDialog. Open the dialog and position it on top of the RadRadioButton so when you double click on a file the mouse cursor to be exactly over the RadRadioButton. Double click a file and you will see that the RadRadioButton is checked. This behavior can be changed by changing the ClickMode of the RadioButtonElement but setting it has no effect.

You can't handle the KeyUp event for RadCheckBox if the key pressed is Enter

You can't handle the KeyDown event for RadRadioButton if the key pressed is Enter.

Pressing backspace key in ComboBox element added to a RadDropDownButton closes that popup box and doesn't allow you to do any modification

Sometimes after rapid clicking on RadSplitButton, its DropDown stops closing when the user clicks outside it.

1. Create new project and add 2 buttons
2. Disable the second button
3. On first button click, enable the second button
4. Set the second button to be AcceptButton
5. Run the project and click the first button

1. Create a new application and add RadButton.
2. Set AcceptButton property of the form to point to the button.
3. Run the application and try to hover the button.

FIX. RadSplitButton - mnemonics does not open the drop down until it was opened with click

FIX. RadSplitButton - TextChanged event is fired before the text is changed

RadSplitButton shows incorrect the vertical scroll bar (overlaps the buttons and the thumb) and shows only the first item, when only two items are added.

The following events does not fire:
radMenuComboItem1.DropDownClosing += new RadPopupClosingEventHandler(radMenuComboItem1_DropDownClosing);
radMenuComboItem1.DropDownClosed += new RadPopupClosedEventHandler(radMenuComboItem1_DropDownClosed);
The ComboBoxItem has been replaced with a RadDropDownList. The following events are fired as expected:
this.radSplitButton1.DropDownButtonElement.DropDownClosing += new RadPopupClosingEventHandler(DropDownButtonElement_DropDownClosing);
this.radSplitButton1.DropDownButtonElement.DropDownClosed += new EventHandler(DropDownButtonElement_DropDownClosed);

To reproduce:
1. Drag a RadButton from the ToolBox and drop it onto the form. 
2. Drag a TelerikMetroBlue theme from the ToolBox and drop it onto the form. 
3. Change the button's theme at design time. You will notice the strange border around the control.
Please refer to the attached gif file.

However, when you save the form and reopen it the button looks ok.

To reproduce:
public class RadForm1
{
	private RadButtonElement btnHelp;

	private void RadForm1_Load(object sender, EventArgs e)
	{
		btnHelp = new RadImageButtonElement();
		btnHelp.AutoSize = true;
		btnHelp.ShowBorder = false;
		btnHelp.Image = My.Resources.Resources.help;
		btnHelp.DisplayStyle = DisplayStyle.Image;
		btnHelp.ButtonFillElement.Visibility = ElementVisibility.Hidden;
		btnHelp.ClickMode = ClickMode.Release;
		btnHelp.Click += btnHelp_Click;

		this.FormElement.TitleBar.SystemButtons.Children.Insert(0, btnHelp);
	}

	private void btnHelp_Click(object sender, EventArgs e)
	{
		Process.Start("http://www.telerik.com");
	}
	public RadForm1()
	{
		Load += RadForm1_Load;
	}

}

Workaround:
Use the Press ClikMode.

Please look at the attached screenshot.

Workaround:
RadRadiomark radioMark = this.radRadioButton1.ButtonElement.Children[1].Children.Last() as RadRadiomark;
radioMark.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias;

To reproduce:
- Set the shape at design time with the shape editor.
- Start the application or restart the designer.

Workaround:
Set the shape in code behind.