//remove one item
tls.rightList().selectedItem(1);
tls.removeButton().click();
checkLabelsCorrectness(tls, new String[]{"item_Label_1", "item_Label_4", "item_Label_6", "item_Label_5"},
new String[]{"item_Label_3", "item_Label_2", "item_Label_7"}, "Available items", "Selected items");
submit.clickAndWait();
tlsOutput.assertText("item_Value_3 item_Value_2 item_Value_7 ");
//remove one item by doubleclick
tls.rightList().evalExpression("ondblclick()");
checkLabelsCorrectness(tls, new String[]{"item_Label_1", "item_Label_4", "item_Label_5", "item_Label_6", "item_Label_2"},