An apparatus comprising: a user interface of a trading application, wherein the user interface is configured with a lockable portion that displays market data and a single activation control that corresponds to an unlock region; a mode management module configured to update a mode status of the user interface; a gestural input detecting module configured to detect a gestural input with respect to the single activation control of the user interface; a mode change detecting module configured to detect a gestural event with respect to the single activation control associated with the gestural input detected by the gestural input detecting module, wherein: in response to the mode change detecting module detecting a first gestural event with respect to the single activation control associated with a first detected gestural input, the mode management module is configured to unlock the lockable portion of the user interface, thereby to enable user interaction with activated components associated with the trading application, the first gestural input including a selection of the single activation control and the first gestural event including a continued hold of the single activation control, and wherein, during said continued hold and in response to the mode change detecting module detecting a second gestural event with respect to the single activation control associated with a second detected gestural input, the mode management module is configured to lock the lockable portion of the user interface to disable user interaction with the trading application, whereby the second gestural input includes a release of the single activation control. a user interface of a trading application, wherein the user interface is configured with a lockable portion that displays market data and a single activation control that corresponds to an unlock region; a mode management module configured to update a mode status of the user interface; a gestural input detecting module configured to detect a gestural input with respect to the single activation control of the user interface; a mode change detecting module configured to detect a gestural event with respect to the single activation control associated with the gestural input detected by the gestural input detecting module, in response to the mode change detecting module detecting a first gestural event with respect to the single activation control associated with a first detected gestural input, the mode management module is configured to unlock the lockable portion of the user interface, thereby to enable user interaction with activated components associated with the trading application, the first gestural input including a selection of the single activation control and the first gestural event including a continued hold of the single activation control, and wherein, during said continued hold and in response to the mode change detecting module detecting a second gestural event with respect to the single activation control associated with a second detected gestural input, the mode management module is configured to lock the lockable portion of the user interface to disable user interaction with the trading application, whereby the second gestural input includes a release of the single activation control.