Can't See the CheckBox in canvas and the y coordinate is always negtive when you add a new CheckButton component to canvas

Steps:
1.Create a QtQuick Application for symbian component using the wizard
2.Change the MainPage.qml code as follows:
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Page

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3.Switch to design mode
4.Drag and drop a CheckButton component to Canvas
5.Drag and drop another CheckButton component to Canvas

Expected result:
User can see the CheckBox in canvas and do some interactive operation using the designer

Actual result:
User can not see the CheckBox in canvas.

Comment:
SDKTestRound17

Unless user set the anchor of the component by relative anchors to parent component or brother component, the position relation is a little bit clear, or else, if users use the direct coordinate, until the qml is loading to viewer, the user or UI designer can't see their original design.It's not so good to the user.