avr: added MainWindow_GetFirstChildOfContentWidget

avr/modules/lcd2/gui2/base/mainwindow.asm

@@ -120,6 +120,31 @@ MainWindow_GetContentWidget:
 
 
 
+; ---------------------------------------------------------------------------
+; @routine MainWindow_GetContentWidget @global
+;
+; @param Y address of widget
+; @param X parent widget (if any)
+; @return CFLAG set, if found, cleared otherwise
+; @return r19:r18 resulting object
+; @clobbers r16
+
+MainWindow_GetFirstChildOfContentWidget:
+  push yl
+    push yh
+      bigcall MainWindow_GetContentWidget  ; r19:r18=content window (R16)
+      brcc MainWindow_GetFirstChildOfContentWidget_popRet
+      mov yl, r18
+      mov yh, r19
+      bigcall OBJ_GetFirstChild            ; get first child
+MainWindow_GetFirstChildOfContentWidget_popRet:
+    pop yh
+  pop yl  
+  ret
+; @end
+
+
+
 
 
 ; ***************************************************************************