Access UI Control and Its Children at Runtime to Modify Properties | UI5

Based on user actions/output of user action, sometimes, other UI control's properties change. This behavior can be achieved by accessing UI controls mAggregation node at run time and setting desired values in UI control properties. Example of modifying 'enabled' property of a button which resides within a List's Custom list Items at place number 2. First UI control is a label, Second is the Button whose property is required to be modified