Fixed context menu not working with Mono. (fixes #181)

Author: KN4CK3R

ReClass.NET/Forms/LogForm.Designer.cs

@@ -1,4 +1,5 @@
 using System;
+using System.ComponentModel;
 using System.Data;
 using System.Diagnostics.Contracts;
 using System.Drawing;
@@ -129,6 +130,13 @@ private void SelectRow_CellMouseDown(object sender, DataGridViewCellMouseEventAr
 			}
 		}
 
+		private void contextMenuStrip_Opening(object sender, CancelEventArgs e)
+		{
+			var sourceControl = (sender as ContextMenuStrip)?.SourceControl;
+
+			e.Cancel = sourceControl == null || (sourceControl == modulesDataGridView && GetSelectedModule() == null) || (sourceControl == sectionsDataGridView && GetSelectedSection() == null);
+		}
+
 		private void setCurrentClassAddressToolStripMenuItem_Click(object sender, EventArgs e)
 		{
 			LinkedWindowFeatures.SetCurrentClassAddress(GetSelectedAddress(sender));