---
title: "Enable Control"
slug: "enable-control"
tags: ["Controls", "Form", "active form flows"]
updated: 2025-07-11T14:28:53Z
published: 2025-07-11T14:28:53Z
canonical: "documentation.decisions.com/enable-control"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://documentation.decisions.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Enable Control

| Step Details |
| --- |
| **Introduced in Version** | 7.0 |
| **Last Modified in Version** | 7.0 |
| **Location** | Form Rules |

The Enable Control step selectively enables a specific Form control. Developers can dynamically control the interactivity and usability of a control based on specific conditions. This step is particularly useful when there is a need to enable user interaction with a control, such as allowing data entry or selection based on certain conditions. Pair this step with the [Disable Control](/step-library/docs/disable-control) step to enable and disable controls based on the same criteria.

---

## Properties

#### Inputs

| Property | Description | Data Type |
| --- | --- | --- |
| Form Control | Choose the desired Form Control to enable. The available Form Controls are under the **Form Data** category when picking data from the Flow. | FormControlData |

![](https://cdn.document360.io/6ef8bcc1-6489-4486-9ad1-83acff7e5df0/Images/Documentation/2023-06-01_16h23_11.png)

---

## Common Errors

### Object reference not set to an instance of an object.

The Form Control Input is not mapped to a Form Control. Evaluate the mapping to this step to correct the problem.

#### Exception Message:

```csharp
Exception Stack Trace: DecisionsFramework.Design.Flow.ErrorRunningFlowStep: Error running step Enable Control[EnableControlStep] in flow [ Rule Flow 1]: Object reference not set to an instance of an object.
 ---> System.NullReferenceException: Object reference not set to an instance of an object. at DecisionsFramework.Design.Flow.FlowStep.BuildMappingData(FlowStateData data
 at DecisionsFramework.Design.Flow.FlowStep.Start(String flowTrackingID, String stepTrackingID, FlowStateData data, AbstractFlowTrackingData trackingData, RunningStepData currentStepData)
   --- End of inner exception stack trace ---
```

---

---

Related Information

Articles: [Active Form Flow Overview](https://documentation.decisions.com/docs/active-form-flows-overview)

## Related

- [End Form Session Step](/end-form-session.md)