Complete IgrCombo templating sample after bug fix

[georgianastasov]

Description:

We need to ensure that the IgrCombo combo templating sample is implemented after resolving the existing bug. This sample is currently non-functional due to the bug described in Bug ID 29182.

Steps to Reproduce:

1. Attempt to use the templating feature in the IgrCombo ComboBox component.
2. Observe that the feature does not work as expected.

Expected Behavior:

The IgrCombo ComboBox should correctly display templates as per the provided configuration.

Current Behavior:

The templating feature does not work due to the unresolved bug.

Additional Notes:

• The templating sample must be revisited and tested thoroughly once the bug fix is applied.
• Ensure that new sample is created and verified for accuracy.