How to tell whether the cell is expanded or not

private void ShowCellStatus(int rowIndex, int colIndex)

{
 
var cell = pivotGrid1.InternalGrid.Model[rowIndex, colIndex];
 
var coveredCellsInfo = this.pivotGrid1.InternalGrid.CoveredCells.GetCellSpan(rowIndex, colIndex);
 
if (cell.CellType.Equals("ExpanderCell"))
 
{
 
var summaryCell = this.pivotGrid1.InternalGrid.Model[coveredCellsInfo.Bottom + 1, colIndex];
 
var isExpanded = (summaryCell.CellIdentity as Syncfusion.Windows.Controls.PivotGrid.PivotGridStyleInfoIdentity).PivotCellInfo.Tag == null;
 
if (isExpanded)
 
{
 
MessageBox.Show("Specified cell[" + rowIndex + "," + colIndex + "] is in expanded status!");
 
}
 
else
 
{
 
MessageBox.Show("Specified cell[" + rowIndex + "," + colIndex + "] is in collapsed status");
 
}
 
}
 
}