Question

enter code hereI’ve built a winform MDI application based on two baseforms, a listform with a grid (_ListForm) and a dataform to display the child data (_DataForm).

When I load an inherited dataform into the MDI, the activated event from the base-form (_DataForm) is triggered and some properties are automatically set. When I load an inherited listform (_ListForm) into the MDI, the activated event is not triggered.

My childform doesn’t have an (overrided) activated event, there is no significant difference in the two forms, just one triggers the event, one doesn’t.

• I’ve added the eventhandler in code and/or with the designer : no
  trigger
• I’ve added a new activated event in the childform and called
  base.onActivated(e) : no trigger

For now I moved some of the code into the textchanged event (which also occurs once), but why is this Activated-event not being triggered?

Can add tons of code-samples if needed, but not sure what to post.

EDIT: Forgot to mention, it’s the same with the LoadEvent – doesn’t trigger in any way.

EDIT: Sources as per request:

_BaseForm : font and general background (no events)

public partial class _BaseForm : Form
{
    public _BaseForm()
    {
        InitializeComponent();
    }

_ListForm : grid and buttons

public partial class _ListForm : _BaseForm
{
    public _ListForm()
    {
        InitializeComponent();
        this.Activated += new EventHandler(_ListForm_Activated);
        this.DialogResult = System.Windows.Forms.DialogResult.Cancel;

        this.grid1.UltraGrid.DisplayLayout.Bands[0].Columns.ClearUnbound();
        this.grid1.UltraGrid.DisplayLayout.Override.AllowAddNew = Infragistics.Win.UltraWinGrid.AllowAddNew.No;
        this.grid1.UltraGrid.DisplayLayout.Override.AllowDelete = Infragistics.Win.DefaultableBoolean.False;
        this.grid1.UltraGrid.DisplayLayout.Override.AllowUpdate = Infragistics.Win.DefaultableBoolean.False;
        this.grid1.UltraGrid.DisplayLayout.Override.CellClickAction = Infragistics.Win.UltraWinGrid.CellClickAction.RowSelect;

        this.grid1.PopulateGridColumns += new FB.Windows.Controls.Grid.PopulateGridColumnsEventHandler(grid1_PopulateGridColumns);
        this.grid1.UltraGrid.InitializeLayout += new Infragistics.Win.UltraWinGrid.InitializeLayoutEventHandler(UltraGrid_InitializeLayout);
        this.grid1.RowSelected += new FB.Windows.Controls.Grid.RowSelectedEventHandler(grid1_RowSelected);
    }

_ListForm event (either in designer or code from ctor):

    this.Activated += new System.EventHandler(this._ListForm_Activated);
    this.Load += new System.EventHandler(this._ListForm_Load);

The event itself:

private void _ListForm_Activated(object sender, EventArgs e)
{
    if (AutoSearchOnOpen)
    {
        button1_Click(sender, e);
        this.grid1.Focus();
        this.ActiveControl = this.grid1;
    }
    else
    {
        this.textBox1.Focus();
        this.ActiveControl = this.textBox1;
    }
}

I know the Click inside the activated event will fire each time it’s activated, but for now that doesn’t matter: the main problem is: the whole event wont fire. Although the event in the _DataForm (also inherited from _BaseForm) is fired.

Answer 1

In this case the grid (3rd party control) overloads (hijacks) the activated and loaded events for the form and don’t trigger the base event after the original event.