KATANA: How to layout widget like Katana does it

katana_layout_widgets.py

import UI4.FormMaster.PythonValuePolicy

# Create a node for which to create parameter widgets
node = NodegraphAPI.CreateNode('Alembic_In', NodegraphAPI.GetRootNode())

# Get a couple of parameters from the node
addForceExpandParameter = node.getParameter('addForceExpand')
addBoundsParameter = node.getParameter('addBounds')
fpsParameter = node.getParameter('fps')

# Create parameter policies for the parameters
addForceExpandParameterPolicy = UI4.FormMaster.CreateParameterPolicy(None, addForceExpandParameter)
addBoundsParameterPolicy = UI4.FormMaster.CreateParameterPolicy(None, addBoundsParameter)
fpsParameterPolicy = UI4.FormMaster.CreateParameterPolicy(None, fpsParameter)

# Create a policy to group the above parameter policies, and set a widget hint on it to hide the group's title
myGroupPolicy = UI4.FormMaster.PythonValuePolicy.PythonValuePolicy('myGroup', {})
myGroupPolicy.addChildPolicy(addForceExpandParameterPolicy)
myGroupPolicy.addChildPolicy(addBoundsParameterPolicy)
myGroupPolicy.addChildPolicy(fpsParameterPolicy)
myGroupPolicy.getWidgetHints()['hideTitle'] = True

# Create and show the parameter widgets
groupFormWidget = UI4.FormMaster.KatanaFactory.ParameterWidgetFactory.buildWidget(None, myGroupPolicy)
groupFormWidget.show()

Sorting the widgets order:

...
myGroupPolicyData = {
    '__childOrder': ['fps', 'addForceExpand', 'addBounds'],
}
myGroupPolicy = UI4.FormMaster.PythonValuePolicy.PythonValuePolicy('myGroup', myGroupPolicyData)
...