The example bellow provides example of ControlPanelBase abstract class implementation. For the sake of simplicity most of the methods are clipped. The ControlPanel class provides Mode property so that differently controls could be rendered depending on it, thus imitating separate controls. The controls to render are determined on the CreateChildControls method. The ControlPanel constructor also takes care about the CommandPanel controls initialization. In this case it initializes one new control which is supposed to implement the ICommandPanel interface.

C#

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public enum DisplayMode {    CategoriesList,    CategoriesEdit,    TypesList,    TypesEdit } public class ControlPanel : ControlPanelBase {    public ControlPanel()    {        base.commandPnls = new ICommandPanel[] { new ToolBoxPanel(this) };    }    public DisplayMode Mode    {        get        {            return this.mode;        }        set        {            this.mode = value;        }    }    protected override void OnInit(EventArgs e)    {        base.OnInit(e);        base.Title = Messages.ModuleTitle;        if (base.Page != null)        {            base.Page.RegisterRequiresControlState(this);        }    }    protected override object SaveControlState()    {        //Save information in the control state here.    }    protected override void LoadControlState(object savedState)    {        //Load the information from the control state.    }    protected override void CreateChildControls()    {        this.Controls.Clear();        switch (this.mode)        {            case DisplayMode.CategoriesList:                CreateCategoriesListView();                break;            case DisplayMode.CategoriesEdit:                CreateCategoriesEditView();                break;            case DisplayMode.TypesList:                CreateTypesListView();                break;            case DisplayMode.TypesEdit:                CreateTypesEditView();                break;        }    }    private void CreateCategoriesListView()    {        //Provide implementation for creating the categories list view controls.    }    private void CreateCategoriesEditView()    {        //Provide implementation for creating the categories edit view controls.    }    private void CreateTypesListView()    {        //Provide implementation for creating the types list view controls.    }    private void CreateTypesEditView()    {        //Provide implementation for creating the types edit view controls.    }    public void SetMode(DisplayMode mode)    {        this.mode = mode;        this.ChildControlsCreated = false;    }    private DisplayMode mode; }