layer combobox width change

pcbnew/tool_pcb.cpp

@@ -618,8 +618,19 @@ WinEDAChoiceBox* WinEDA_PcbFrame::ReCreateLayerBox( WinEDA_Toolbar* parent )
     {
         if( parent == NULL )
             return NULL;
+        
         m_SelLayerBox = new WinEDAChoiceBox( parent, ID_TOOLBARH_PCB_SELECT_LAYER,
-                                            wxPoint( -1, -1 ), wxSize( -1, -1 ) );
+                                            
+                                wxPoint( -1, -1 ),
+#if defined(__UNIX__)                  
+                                // Width enough for the longest string: "Component (Page Down)"
+                                // Maybe that string is too long?
+                                wxSize( 230, -1 )     
+#else
+                                wxSize( LISTBOX_WIDTH+40, -1 )
+#endif
+                              );
+        
         parent->AddControl( m_SelLayerBox );
     }