diff --git a/include/array.h b/include/array.h
index ada4a0e5c..92b715704 100755
--- a/include/array.h
+++ b/include/array.h
@@ -214,7 +214,7 @@ inline TObject& TArray::operator[] (int index) const
 #define FOR_EACH_ARRAY_ITEM_BACK(__arr, __r, __obj) \
   TObject* __obj;                                   \
   for (int __r = __arr.last();                      \
-       __obj = __arr.objptr(__r);                   \
+       (__obj = __arr.objptr(__r));                   \
        __r = __arr.pred(__r))
 
 
diff --git a/include/controls.cpp b/include/controls.cpp
index b99fdf4f7..885d4d098 100755
--- a/include/controls.cpp
+++ b/include/controls.cpp
@@ -2153,6 +2153,9 @@ void TDropDownList::create()
   ld->no_vert_lines = TRUE;
   ld->resize_with_window = TRUE;
   ld->single_select = TRUE;
+#ifdef LINUX
+  ld->scroll_on_thumb_track = TRUE;
+#endif
   
   // compute size in pixel of field (with button enclosed)
   RCT r; xi_get_rect(_obj, (XinRect *) &r);
diff --git a/include/msksheet.cpp b/include/msksheet.cpp
index 6319a2a0c..66213b13d 100755
--- a/include/msksheet.cpp
+++ b/include/msksheet.cpp
@@ -514,6 +514,9 @@ TSpreadsheet::TSpreadsheet(
   l->active_back_color = FOCUS_BACK_COLOR;
   l->white_space_color = MASK_DARK_COLOR;     
   l->rule_color        = MASK_DARK_COLOR;
+#ifdef LINUX
+  l->scroll_on_thumb_track = TRUE;
+#endif
   
   // Definizione della prima colonna (numero di riga)
   word attr = XI_ATR_RJUST;                                            
diff --git a/include/sheet.cpp b/include/sheet.cpp
index b7e2633b5..a112a8f7e 100755
--- a/include/sheet.cpp
+++ b/include/sheet.cpp
@@ -222,6 +222,9 @@ TSheet_control::TSheet_control(
   l->scroll_bar_button  = TRUE;
   l->white_space_color  = MASK_DARK_COLOR;
   l->rule_color         = MASK_DARK_COLOR;
+#ifdef LINUX
+  l->scroll_on_thumb_track = TRUE;
+#endif
 
   // Definizione della prima colonna (numero di riga)
   const long attr = XI_ATR_VISIBLE | XI_ATR_RJUST | XI_ATR_SELECTABLE;