I'm working on a plug-in which will show a panel. When the panel is closed I want to unload the plug-in.
These features are badly documented but I found a delegate function called AddOnCloseHandler which should do the trick.
But I can't get it to work. Most probably because I don't use the delegate in the proper manner. I still find delegate a bit difficult ;)
Here's some code:

    /// <summary>
    /// This class holds all code used in this form
    /// </summary>
    public partial class TopPanel : Form
    {
        /// <summary>The reference to the MapWindow map object</summary>
        private MapWindow.Interfaces.IMapWin mapWin;

        /// <summary>The reference to the panel object</summary>
        private Panel topUIPanel = null;

        /// <summary>
        /// Initializes a new instance of the TopPanel class, used by the form
        /// </summary>
        /// <param name="mapWin">The reference to the MapWindow map object.</param>
        /// <param name="parentHandle">The window handle of the main MapWindow form.</param>
        public TopPanel(MapWindow.Interfaces.IMapWin mapWin, int parentHandle)
        {
            this.InitializeComponent();
            this.mapWin = mapWin;

            System.IntPtr tempPtr = (System.IntPtr)parentHandle;
            Form mapFrm = (Form)System.Windows.Forms.Control.FromHandle(tempPtr);

            mapFrm.AddOwnedForm(this);
             
            // The trick of creating dockable panels is to create a standard form with a panel,
            // this panel is used to create the dockable panel.

            // Create new MapWindow panel, the caption is the name of the form:
            this.topUIPanel = this.mapWin.UIPanel.CreatePanel(this.Name, MapWindow.Interfaces.MapWindowDockStyle.Top);

            // Add panel to the mapwindowpanel
            this.topUIPanel.Controls.Add(this.panel1);

            // Add handler
            MapWindow.Interfaces.OnPanelClose OnCloseFunction = Panel1_OnClose();
            this.mapWin.UIPanel.AddOnCloseHandler(this.Name, OnCloseFunction);
        }

        private MapWindow.Interfaces.OnPanelClose Panel1_OnClose()
        {
            // The Dispose method of the form removes the panel, closes the form and disposes it:
            this.Dispose();
            // Don't know what to return???????????
            return null;
        }
    }

Any help is much appreciated.

Thanks,

Paul

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The Netherlands
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Good day all,

I would also like to know how the AddOnCloseHandler works. I also have trouble implementing the OnClosePanel interface. I tried looking over the mwIdentifier code on how it works but I can't seem to figure out what I am missing. I'm using VB.net by the way.

Thanks.