Hi rayzhahng,
Thank you for your interest in Syncfusion products.
We can get the hidden column Id value of the parent table from the "RecordDoubleClicked" event. Please refer to the following code snippets.
public void ggc_RecordDoubleClicked(object sender, RecordDoubleClickEventArgs e)
{
TextBox1.Text = e.Row.Record.GetValue("Category ID").ToString();
}
Also, we have prepared the sample for your reference and the same can be downloaded from the following link:
sample-100185-1852474790.zipHowever, we having issue with getting the child table record value.
The issue identified in this forum 'RecordDoubleClicked event issue with hierarchy grid' has been confirmed as a defect; hence we have logged a defect report. However, we do not provide confidential information and patches in the general forum, so could you please create a new incident such that we can fix the issue and provide the patch for you.
Please let us know if you need any further assistance.
Regards,
Eswari.S