Enable the "leave" button in SourceSafe. Details at http://harriyott.com/2006/07/sourcesafe-cant-leave-well-alone.aspx

SourceSafe Enable Leave Button.cs

namespace Harriyott.SourceSafeLeaveEnable
{
    public partial class MainForm : Form
    {
        [DllImport("User32.dll")]
        public static extern Int32 FindWindow(String lpClassName, String lpWindowName);
        [DllImport("user32.dll", EntryPoint = "SendMessage")]
        public static extern int SendMessage(IntPtr hWnd, int Msg, int wParam, int lParam);
        [DllImport("User32.dll")]
        public static extern int FindWindowEx(int hwndParent, int hwndChildAfter, string strClassName, string trWindowName);

        [DllImport("user32.dll")]
        static extern bool EnableWindow(IntPtr hWnd, bool bEnable);
 
        public MainForm()
        {
            InitializeComponent();
        }
 
        private void btnEnable_Click(object sender, EventArgs e)
        {
            // Find the prompt window
            int windowHandle = FindWindow(null, "WindowsForms10.Window.8.app.0.11ecf05");
            if (windowHandle > 0)
            {
                // Find the radio button
                int leaveHandle = FindWindowEx(windowHandle, 0, "Button", "&Leave this file?");
                if (leaveHandle > 0)
                {
                    EnableWindow((IntPtr)leaveHandle, true);
                    lblStatus.Text = "Enabled";
                }
                else
                {
                    lblStatus.Text = "Cannot find the 'Leave this file?' control";
                }
            }
            else
            {
                lblStatus.Text = "Cannot find the prompt window";
            }
        }
    }
}