ControlAssetTemplatePanelChildren Property

public IControlChildren Children { get; }

string parentControlName = "Panel1";
IControlParent parentControl = Screen.ScreenControls[parentControlName] as IControlParent;
foreach (IControlBase childControl in parentControl.Children) {
    // code
}

// create control
string addControlName = "Button1";
IControlBase addControl = ControlFactory.CreateControl(ControlKind.Button, "Button1");

// add control to parent
string parentControlName = "Panel1";
IControlParent parentControl = Screen.ScreenControls[parentControlName] as IControlParent;
parentControl.Children.Add(addControl);

// get control to remove
string removeControlName = "Button1";
IControlBase removeControl = Screen.ScreenControls[removeControlName];

// remove from parent
IControlParent parentControl = removeControl.Parent;
parentControl.Children.Remove(removeControl);