1>How should I know if user has changed it's location, size etc.. Is there any listener to monitor ChartObject ?
I need it because we need to put price marker and when User change it we need to special work.
2>How to identify particular object. By its Text ?

Hi
In an ChartObjectListener interface is the function moved() (https://www.dukascopy.com/swiss/docs/api/index.htm).
In an IChart interface is the function get(String key) https://www.dukascopy.com/swiss/docs/api/index.htm.
Please consider this documentation:https://www.dukascopy.com/swiss/docs/interfaces/IChart.htm

Thats fine. But now I am facing new problem.
Case :
I opened chart for EUR/USD by double clicking Workspace->Currency->EUR/USD.
Then I ensured that EUR/USD is selected in Combobox of opened chart.
Then I created few PriceMarker and Lines.
After that, In strategy I called following code on every Tick event.

IChart chart = context.getChart(Instrument.EURUSD);
List<IChartObject> shapes = chart.getAll();
System.out.println(shapes.size()):
System.out.println(shapes):

Surprisingly, when I executed strategy, Size was printed 0 and there were no shapes in list.

Did I done any Mistake ?

Thanking you.

It's not allowed to access an objects, that are created by another strategy or user. It means that, you should draw an object from your strategy and only after that you could access it.