I have a BindingList of Record set as the data source of an UltraTree.  Record can contain a child list of Records forming an object tree. 

There are two user visible fields on each Record, RecordType and VeryLongString.   I would like the column of VeryLongString to alway fill the the available space. As much text of the string should be displayed.  I have set Docking to Fill, used the  OutlookExpress and other settings that seemed to have been suggested in this forum in the past.  But I still am not getting the effect I want,  the column is not filling the control area and then the data in VeryLongString gets trimmed and I only see ... for some of the data even through there is plenty of horizontal space.   I tried turning TextTrimming to None but the trim still happens.   Rougly here is what I am doing

What to I have to do to make VeryLongString column fill all available space and for the TextTrim NOT to happen. 

enum RecordType
{
// type values
}

public class Record
{

public RecordType RecordType
{
get;

}

public String VeryLongString
{
get;
}

public BindingList<Record> Records
{
get { return ... // tree of child records
}
}

//construct control
....

ultraTree1 = new Infragistics.Win.UltraWinTree.UltraTree();
ultraTree1.Override.ShowExpansionIndicator = Infragistics.Win.UltraWinTree.ShowExpansionIndicator.CheckOnDisplay;
ultraTree1.Dock = DockStyle.Fill;
ultraTree1.ViewStyle = Infragistics.Win.UltraWinTree.ViewStyle.OutlookExpress;
ultraTree1.ColumnSetGenerated += ultraTree1_ColumnSetGenerated;
ultraTree1.ColumnSettings.AutoGenerateColumnSets = true;
ultraTree1.Appearance.TextTrimming = Infragistics.Win.TextTrimming.None;
this.view_panel.Controls.Add(ultraTree1);

BindingList<Record> data = ...

ultraTree1.DataSource = data;

void ultraTree1_ColumnSetGenerated(object sender, Infragistics.Win.UltraWinTree.ColumnSetGeneratedEventArgs e)
{

for (int i = 0; i < e.ColumnSet.Columns.Count; i++)
{
Infragistics.Win.UltraWinTree.UltraTreeNodeColumn column = e.ColumnSet.Columns[i];
string s = column.Key;
if (column.Key == "RecordType")
{
column.AllowCellEdit = Infragistics.Win.UltraWinTree.AllowCellEdit.Disabled;
column.AutoSizeMode = Infragistics.Win.UltraWinTree.ColumnAutoSizeMode.None;
column.LayoutInfo.PreferredLabelSize = new System.Drawing.Size(80, 20);
column.LayoutInfo.PreferredCellSize = new System.Drawing.Size(80, 20);

}
else if (column.Key == "VeryLongString")
{

pathColumns.Add(column);
column.AllowCellEdit = Infragistics.Win.UltraWinTree.AllowCellEdit.Full;
column.AutoSizeMode = Infragistics.Win.UltraWinTree.ColumnAutoSizeMode.AllNodesWithDescendants;
column.LayoutInfo.AllowLabelSizing = Infragistics.Win.UltraWinTree.LayoutSizing.Horizontal;
column.PerformAutoResize();
}

}
}