Hi,

I have a custom control in which i have a property based on
CollectionBase class.

like the following one :
//------- XGrid.cs file --------------//
[Category("Behavior"),
 Browsable(true),
 Description("Column Collection"),
DesignerSerializationVisibility(DesignerSerializationVisibility.Content)]
public ColumnsCollection Columns
{
 get
 {
  if (this.m_Columns == null)
  {
   this.m_Columns = new ColumnsCollection(this);
  }
  return this.m_Columns;
 }
}
protected internal virtual void OnColumnAdded(ColumnsCollectionEventArgs e)
{
 this.Invalidate(); // <- this does not refresh the control on design
time :-(

 if (ColumnAdded != null)
 {
  ColumnAdded(this, e);
 }
}

//------- ColumnsCollection.cs file --------------//

this collection (named Columns) is as the following :

public class ColumnsCollection : CollectionBase
{
...
 public ColumnsCollection(XGrid owner): base()
 {
  if (owner == null)
  {
   throw new ArgumentNullException("owner");
  }

  this.m_owner = owner;
 }

 public void Add(Column column)
 {
  if (column == null)
  {
   throw new System.ArgumentNullException("Column is null");
  }
  int index = this.List.Add(column);
  this.RecalculateTotalWidth();
  this.OnColumnAdded(new ColumnEventArgs(column,  this.IndexOf(column),
ColumnEventType.ColumnAdded, null));
 }
...
 protected virtual void OnColumnAdded(ColumnEventArgs e)
 {
  this.m_owner.OnColumnAdded(e);
 }
...
}

unfortunatelly, my control is not refresh automatically when i add a new
column to the Columns Property.
i have the same issue with removing column.

any idea ?
thanks a lot,

RAF