LayoutChanged Event

You can use this event to monitor changes to the report layout and update any dependent data such as SQL queries or custom user interfaces (report explorers, group sections dialog, etc).

C#

// ardMain_LayoutChanged - runs when a control/section in the layout is added/deleted/moved

private void ardMain_LayoutChanged(object sender, GrapeCity.ActiveReports.Design.LayoutChangedArgs e)
{
    if(e.Type == GrapeCity.ActiveReports.Design.LayoutChangeType.ControlAdd)  //Control Added
    {
        this._controlAdded = true;
        ResetToolbox();
        tbToolbox.Buttons[0].Pushed = true;
    }
    else
    {
        this._controlAdded = false;
    }
                    
    if(e.Type == GrapeCity.ActiveReports.Design.LayoutChangeType.ControlDelete)  //Control Deleted
    {
        this._controlDeleted = true;
    }
    else
    {
        this._controlDeleted = false;
    }

    if(e.Type == GrapeCity.ActiveReports.Design.LayoutChangeType.SectionAdd)  //Section Added
    {
        this._sectionAdded = true;
    }
    else
    {
        this._sectionAdded = false;
    }
    
    if(e.Type == GrapeCity.ActiveReports.Design.LayoutChangeType.SectionDelete)  //Section Deleted
    {
        this._sectionDeleted = true;
    }
    else
    {
        this._sectionDeleted = false;
    }
}

Visual Basic

'ardMain_LayoutChanged - runs when a control/section in the layout is added/deleted/moved
Private Sub ardMain_LayoutChanged(ByVal sender As Object, ByVal e As GrapeCity.ActiveReports.Design.LayoutChangedArgs) Handles ardMain.LayoutChanged
    If e.Type = GrapeCity.ActiveReports.Design.LayoutChangeType.ControlAdd Then 'Control Added
        Me._controlAdded = True
        ResetToolbox()
        tbToolbox.Buttons(0).Pushed = True
    Else
        Me._controlAdded = False
    End If

    If e.Type = GrapeCity.ActiveReports.Design.LayoutChangeType.ControlDelete Then 'Control Deleted
        Me._controlDeleted = True
    Else
        Me._controlDeleted = False
    End If
  
    If e.Type = GrapeCity.ActiveReports.Design.LayoutChangeType.SectionAdd Then 'Section Added
        Me._sectionAdded = True
    Else
        Me._sectionAdded = False
    End If
 
    If e.Type = GrapeCity.ActiveReports.Design.LayoutChangeType.SectionDelete Then 'Section Deleted
        Me._sectionDeleted = True
    Else
        Me._sectionDeleted = False
    End If
End Sub

Reference

Designer Class
Designer Members