C#

public class SpecialButton : System.Windows.Forms.Button
{
    public SpecialButton()
    {
    }

    private bool flag1 = true;
    public bool Flag1
    {
        get
        {
            return flag1;
        }
        set
        {
            if(value!=flag1)
                flag1 = value;
        }
    }

    private bool flag2 = true;
    public bool Flag2
    {
        get
        {
            return flag2;
        }
        set
        {
            if(value!=flag2)
                flag2 = value;
        }
    }

    private bool ValidateClick()
    {
        //If Flag1 and Flag2 are true, the Click event will be fired
        return Flag1&&Flag2;
    }

    protected override void OnMouseDown(MouseEventArgs e)
    {
        if(ValidateClick())
        {
            //Validation ok (Click will fire)
            base.OnMouseDown (e);
        }
        else
        {
            //give some feedback to the user (MessageBox)
        }
    }
}