[LVGL] The custom widget should keep alone that shall not tangle with objects[]

[Staok]

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While eez-studio develop lvgl proj, the custom widget should keep alone, that shall not tangle with objects[].
You can refer to the "component" implementation of squareLine, its very well and convenient to use.
“component” or custom widget shall be a stand alone things that can create / remove in runtime! Like a dialog pop and disappear!
Very hope that the eez-studio lvgl custom widget can be a real "component"!!

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