/// <summary>
/// Adds some groupItem to the aggregation {@link #getGroupItems groupItems}.
/// </summary>
/// <param name="oGroupItem">The groupItem to add; if empty, nothing is inserted</param>
/// <returns>Reference to <code>this</code> in order to allow method chaining</returns>
public extern virtual sap.m.P13nGroupPanel addGroupItem(sap.m.P13nGroupItem oGroupItem);
/// <summary>
/// Checks for the provided <code>sap.m.P13nGroupItem</code> in the aggregation {@link #getGroupItems groupItems}. and returns its index if found or -1 otherwise.
/// </summary>
/// <param name="oGroupItem">The groupItem whose index is looked for</param>
/// <returns>The index of the provided control in the aggregation if found, or -1 otherwise</returns>
public extern virtual int indexOfGroupItem(sap.m.P13nGroupItem oGroupItem);
/// <summary>
/// Inserts a groupItem into the aggregation {@link #getGroupItems groupItems}.
/// </summary>
/// <param name="oGroupItem">The groupItem to insert; if empty, nothing is inserted</param>
/// <param name="iIndex">The <code>0</code>-based index the groupItem should be inserted at; for a negative value of <code>iIndex</code>, the groupItem is inserted at position 0; for a value greater than the current size of the aggregation, the groupItem is inserted at the last position</param>
/// <returns>Reference to <code>this</code> in order to allow method chaining</returns>
public extern virtual sap.m.P13nGroupPanel insertGroupItem(sap.m.P13nGroupItem oGroupItem, int iIndex);
