using DevExpress.XtraGrid.Views.Grid;
using DevExpress.XtraGrid.Views.Base;

GridView view = gridControl1.FocusedView as GridView;
if(view.IsMasterRow(view.FocusedRowHandle)) {
    int detailIndex = 0;
    view.SetMasterRowExpandedEx(view.FocusedRowHandle, detailIndex, true);
    ColumnView childView = (ColumnView)view.GetDetailView(view.FocusedRowHandle, detailIndex);
    if(childView != null) {
        childView.ZoomView();
        // Perform some actions.
        // ...
        childView.NormalView();
    }
}

Imports DevExpress.XtraGrid.Views.Grid
Imports DevExpress.XtraGrid.Views.Base

Dim View As GridView = gridControl1.FocusedView
If (view.IsMasterRow(view.FocusedRowHandle)) Then
    Dim detailIndex As Integer = 0
    View.SetMasterRowExpandedEx(view.FocusedRowHandle, detailIndex, True)
    Dim childView As ColumnView = View.GetDetailView(view.FocusedRowHandle, detailIndex)
    If Not childView Is Nothing Then
        childView.ZoomView()
        ' Perform some actions.
        ' ...
        childView.NormalView()
    End If
End If

private void gridControl1_ProcessGridKey(object sender, System.Windows.Forms.KeyEventArgs e) {
    if(e.Control) { 
        if(e.KeyCode == Keys.Right) {
            gridControl1.FocusedView.ZoomView();
            e.Handled = true;
        }
        else if(e.KeyCode == Keys.Left) {
            gridControl1.DefaultView.NormalView();
            e.Handled = true;
        }
    }
}

Private Sub gridControl1_ProcessGridKey(ByVal sender As Object, ByVal e As KeyEventArgs) _
Handles gridControl1.ProcessGridKey
    If e.Control Then
        If e.KeyCode = Keys.Right Then
            gridControl1.FocusedView.ZoomView()
            e.Handled = True
        ElseIf e.KeyCode = Keys.Left Then
            gridControl1.DefaultView.NormalView()
            e.Handled = True
        End If
    End If
End Sub