How to get hold of the IFlexyNodeData of a given object in the bound data source?

Each row in the FlexyGantt is represented by an instance of IFlexyNodeData. Objects in your bound data source (set as FlexyGantt's ItemsSource) representing a row in FlexyGantt will then have a corresponding IFlexyGanttNode instance. You can get hold of it as follows:

// Get hold of the IFlexyNodeData corresponding to the very first item in the bound list (note below assumes your ItemsSource is an IList)

IFlexyNodeData fnd = this.fxgantt.FlatTreeItemsSource[((IList)this.fxgantt.ItemsSource)[0]];

// Verify if the data is the same as your object in the data source.

var data = fnd.Data;