References
A framework project can use content from other NuGet packages.
If, for example, an TcHmiButton is to be created in a control factory, the NuGet package Beckhoff.TwinCAT.HMI.Controls
must be integrated (and the control must be added to tsconfig.tpl.json).
Select Manage NuGet Packages from the context menu in the References node.

Select the required package in the Browse tab. It may be necessary to adapt the source in the Package source drop-down box. TwinCAT HMI Official contains a list of all packages that are provided with the TwinCAT HMI setup. TwinCAT HMI Customer contains all packages that were created on this computer.